Electric-lamp adjuster.



PATENTED AUG. 27, 1907.

W. S. HAWKER. ELECTRIC LAMP ADJUSTER.

APPLICATION TILED D B0.1,1905.

Inve nhgr.

WILSON s. mwnssfor DAYTON, OHIO.

ELECTRIC-LAMP ADJUSTER.

Specification of Letters Patent. Application filed December 1,1905. Serial No. 289.928.

Patented Aug. 37, 1907;"

To all whom it may concern:

Be it known that I, WILsoN S. HAWKER, a citizen of thg United States, residing at Dayton, in the county of Montgomery and State oi, Ohio, have invented a new and useful Electric-Lamp Adjuster, thereby giving better lighting results and facilitating any work by artificial light .to which it may be applied.

Following is a specification.

My invention relates to improvements in lamp supports, and particularly to adjustable lamp supports for use with incandescent electric lamps, but which may be used with other devices. r a

The object of the invention is to simplify the con-- struc tion as well as the means and mode of operation of such devices whereby they are not only cheapened in construction, but are rendered more eflicient in use and unlikely to get out of repair.

, A further object is to provide a construction wherein the adjustable arm will be reinforced in such a manner that the arm will be greatly strengthened and stiffened while permitting it to be constructed of comparatively light weight material.

A further object is to provide a universal connection for said arm having an improved frictional retaining device,- and means for regulating the same, aocxtendible section for said arm adapted to insulate the lamp from the support and an improved frictional engaging device for holding the cxtendible arm in its adjusted position.

A further object is to provide a construction in which the supporting arm maybe moved to a position substantially parallel with the side wall or ceiling to which it may be attached With the above primary and other incidental objects in view, as will appear from the specification, the invention consists of the construction, the parts, and the combination and arrangement thereof, hereinafter described and set forth in the claims.

Referring to the accompanying drawings, Figure 1 is a perspective view partly broken away showing the device attached to the ceiling. Fig. 2 is a view showing 'the range of adjustment from perpendicular to horizontal and the extension of the cxtcndible section. Fig. 3

is a perspective view showing thedcvice attached to a side wall, and its rangc of adjustment. Fig. 4 is a perspective view of the device as attached to a pedestal or portable floor stand. Fig. 5 is a perspective view of the swivel lamp clip for securing the lamp to the adjustable arm. Fig. 6 is a bottom plan view of the socket member. 1 i

Like parts are indicated ,by similar characters of reference throughout the several views.

Referring by letter to the drawings, A represents a socket member engaging the spherical head G of the supporting arm L hereinafter described. Located with the socket member A and bearlng'on-the spherical G is a frictional hearing or bmkeblo'c'k B oiwoodoit fiber.

The socket member A is provided with a plate D adjustable in its relation to the soc-Roth means of screws E E. lnterposed bet ween theplate D and the bearing block B is a layer or strip of resilient material 0, preferably rubber, by which the block B is held in yielding engagement with the spherical G, permitting a movement of the block B to compen sate for any irregularity of the said head G. The pres-' sure or tension of the parts is adjusted through the screws E E. p

The adjustable arm L which is secured to the spherical head G comprises a tubular section having thereinv a longitudinal slot K, the edges of which are inturned to form longitudinal inward projecting flanges W W."

By this means the arm L may be of comparatively thili, light material, which, under ordinary conditions, would not possess suflicient strength for the desired purpose; however, by the addition of the longitudinal the rotationoi an extendible section M of the arm L.

The sectibn M is preferably of wood or other non-com ducting material, and is adapted to telescope within the tubular portion L. The section M is provided with a longitudinal 'groove N with which the flang'esW. en-H gage, thus preventing a revoluble movemeiit of said section while permitting alongitudinal movement thereof. I Secured to the eiitremityoi the egrte'ndible section M spring clip 0 adapted to engage and hold an incandescent electric bulb; The pivotal connection permits the bulb to be turned radially about its pivotal connection P,"which is very desirable when the lampis used with a' shade. The base of the clip 0 is arched or formed concave as shown in Fig. 5. p

The construction is such that the spring clip is swiveled on the flat side of the ferrule, and so formed that when pressure is applied by the centrally placed pivotal retaining screw, P, the extremities of the jaws of the holder are drawn together, firmly gripping the lampbut in no wise preventing the swivel adjustment of the lamp; and when the lamp within the jaws, the tension on the base is sufficient to. retain it in its adjusted radial position. Secured to the section M and pro ecting through the slot K of the arm L is an insulated hook or button I to p g is afcrrule Q to a flat surface oi which is pivoted at P, a I

yice. combining an adjustable arm of light weight, pos-' sessing a maximum amount of strength and inflexibil- 5,

ing material, the'lamp will be effectually insulated from the metallic parts of the support.

To hold the extendible section M in its adjusted position, a frictional engaging means is provided between the said section and the interior of the arm L. The inner end of the section M is bifurcated as at H. Interposed within the bifurcated portion is a spring i preferably flat as indicated which is secured in position by a pin V passing through the section M The construction is such that the spring 1 forces the bifurcated end of the section M apart and into contact with the interior of the tubular portion L, thus providing a continuous frictional engagement with the arm L, sufficient to hold the parts in the adjusted position. When in use the device is at Iached to the ceiling or side wall by screws extending through suitable holes X'X in the socket member, and in a position adjacent to the light connection U. By means of the universal joint of the arm L the light may be adjusted radially throughout a range substantially equivalent to half a sphere, the radius of which equals the length of the arm.

By means of the extendible section M the light when in any radial position maybe adjusted to and from the pivotal point. In order that when not in use the arm may be moved to a position substantially parallel with the sidewall or ceiling, a notch F is formed in the socket member A which notch is in alinement with the center of the head G and at right angles to the axis of the socket member A. When the arm I rests in the notch F the arm will extend substantially perpendicular to the axis of the socket member A and for greater security may be engage'd by.& retaining hook S,'as indicated in Fig.2.

It will be seen that there has thus been provided a de ity, which may be constructed at low cost, and which possess the various other features of advantage before enumerated as desirable, and which is obviously susceptible of modification in its form, proportion, detail construction and arrangement of parts without departing from the principle involved, or sacrificing any of its advantages.

Having thus described my invention 1 claim:

1. in an adjustable lump support, an exlendiblc arm comprising a tubular section, having it longitudinal slot therein. lnwaru"projecting llangc. adapted to strengthen and slill'en said tubular section. aid inward projecting llunges being' formed by turning inward lhc edges adjacent to said slot. at second section slidingly mounted In said tubular sectlouQnn-ans for retaining id second section in its adjusted posltion, and meuns'lor securing a lamp thereto, substantially as and for the purpose specified.

2. In an adjustable l. up support an exlcndible arm, comprising a tube having a longitudinal slot therein, a secend section telescoping wllhln said tube having a longitudinal groove therein, inward projecting llnngcs adjacent to said longitudinal slot of lhe first section engaging the longitudinal g'l'oo'vc of the second section. and menus for securing a lamp for said arln substantially as specified.

ii. in a lamp supporting device. an adjuslable arm comprising a tubular section. a solid non-hollow section lelcscoplng \vilhin said lubulul' seclion. said non-hollow section having a longitudinal slot lhcrci-n, dividing and formiug a t'olked inner end of said nun-hollow section, a spring located withinsaidslot and ndaplcd to spread said forked end of the non-hollow section, \\'hcrcb v said forked end will frlelionally engage the interior of the tubular arm, substantially as specified.

4. in a lamp supporting device. an arm. means for securing a lamp thereto, nsphcrical head tcrminallng said arm. a socket member within which said spherical head extends. a bearing block of wood shaped to confoinn to sald spherical head, a plate independent of, but adjustable in its relation with said socket, abody of resilient material interposed between said plate and bearing block, adjusting screws having their heads accessible when the device is attached to the wall or ceiling, said adjusting news extending through said socket member and engaging said adjustable plate, substantially as and for the purpose 5. In a lamp support, a supporting arm having a Hattened bearing surface, a U-shnpcd spring clip havlng an arched base, a pivotal connect ion passing through said base and engaging said arm, said clip being adjustable radially-about its connection, said arched base being placed under tension by the engagement of said pivotal conneetlon to cnuse it to engage the tlat surface and retain holder, and having its upper end forked to receive a flat spring. providing a sllghl. frlctional resistance sullicienl to retain ll in Its position wlthout othen'thstening when said rod is extended to increase the length and range of the main tubular arm. as described and for the purpose set forth. i WILSO" A. HAWKEIL Witnesses LILLIH Itrmrr,

llAllllY I NonAN. 

